DE1168596B - Needle cylinder for circular knitting machines and process for its manufacture - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY GERMAN ÄW ^ SS PATENTAMT Internat. Class: D 04 b

EDITORIAL

Number:
File number:
Registration date:
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German KL: 25 a-20

S 61894 VII a / 25 a
February 24, 1959
April 23, 1964

The present invention relates to needle cylinders for circular knitting machines with the needle channels laterally delimiting steel webs that are inserted into milled longitudinal grooves of the needle cylinder and themselves extend over the entire length of the cylinder, as well as a method for producing such cylinders, which have the characteristics of the invention explained below.

In circular knitting machines such. B. stocking machines, is the use of needle cylinders that are provided with steel webs, which are used in milled longitudinal grooves of the cylinder, known. According to a known method, the individual steel bars are in a dovetail ring groove of the Cylinder held and secured against falling out by segment discs, these segment discs are attached below the individual steel bars on the cylinder. According to another well-known The individual steel bars with shoulder-like parts are moved into the longitudinal grooves the needle cylinder is driven in and connected to the cylinder by means of soft or hard soldering.

According to other known methods, the walls of the needle cylinder are provided at their lower ends with projections which are pressed ^{around the appropriately beveled extensions attached to the webs by upsetting a} 5, so that the webs are held in place and secured against displacement. A modified method is also known, according to which insert rings are screwed or otherwise fastened to the needle cylinder and the webs are held and secured in their position by flanging the edge of these rings against the inclined ends of the webs.

These known manufacturing processes are in some cases very expensive and laborious and grant often no precise cylinder pitch, which results in uneven stitch formation in the hosiery. Applying solder also makes a particularly thorough one. mechanical cleaning of the Needle cylinder from oozing solder required to prevent premature wear of the needle feet as well as to prevent undesired heating of the cylinder in operation.

The invention eliminates the difficulties mentioned by the attachment of the individual steel webs in both end walls of the needle cylinder by pressing the needle cylinder material into incisions in the steel webs in a mutual displacement of the steel webs in a radial and axial as well as in the circumferential direction, a task that occurs in which the object needle cylinder for circular knitting machines and
Process for its manufacture

Applicant:

Sdruzeni podnikü textilniho strojirenstvi,

Chrastava (Czechoslovakia)

Representative:

Dipl.-Ing. H. Seiler, Berlin 19, Oldenburgallee 10, and Dipl.-Ing. H. Stehmann, Nuremberg 2,

Patent attorneys

Named as inventor:

Frantisek Huml,

Cenek Prochäzka, Tfebic (Czechoslovakia)

Claimed priority:

Czechoslovakia from February 24, 1958 (965) - -

of the invention forming needle cylinder as well as by the method for its production in the simplest possible way Way is resolved. The cold pressing of the needle cylinder material is advantageous in both opposite Cuts provided at the ends of the steel webs simultaneously instead of by means of two in the needle cylinder Coaxially guided ram with cutting rings, the cross-sections of which are only the inner ones Fill in half of the cuts in the steel bars.

Details of the subject matter of the invention are from the description of an exemplary embodiment apparent, which is shown in the drawings. The drawings illustrate:

F i g. 1 shows a longitudinal section through a pushed onto a lower ram of a pressing device Needle cylinder after the pressing process is finished,

F i g. 2 is a side view of a single steel web of rectangular cross-section;

F i g. 3 shows a section of a detail "A" in FIG. 1 on an enlarged scale before pressing,

F i g. 4 a partial plan view of the needle cylinder with inserted steel bars before pressing, where the upper ram has been omitted for the purpose of better understanding, on an enlarged scale,

F i g. 5 shows a section through a detail "B" of FIG. 1 before pressing, on an enlarged scale,

409 560/44

I 168

F i g. 6 the same section of the detail "Α" as in FIG. 3, but after the pressing has been completed, in an enlarged view Scale,

F i g. 7 shows a partial plan view of the needle cylinder with inserted steel bars after pressing, where the upper ram has been omitted for the sake of better understanding, on an enlarged scale.

F i g. 8 the same section of the detail "B" as in FIG. 5, but after the pressing has ended, in an enlarged manner Scale.

Steel webs 1 of rectangular cross-section (Fig. 2), which are inserted into milled longitudinal grooves 2 (Fig. 4) of a needle cylinder 3, are used for lateral guidance of the needles to be moved up and down during knitting, the length of each steel web 1 corresponding to the length of the needle cylinder 3, so that the lower end wall 4 and the upper end wall 5 of the needle cylinder 3 with the lower end 6 and with the upper end 7 of each steel web 1 used (Fig. 3 and 5). Both the lower end 6 and the upper end 7 of each steel web 1 is provided with an incision 8 or 8 '. Both incisions 8 and 8 'are arranged opposite one another so that they are equidistant both from the base 9 (FIG. 2) of each steel web 1 and from the base 10 (FIG. 4) of the associated longitudinal groove 2 of the needle cylinder 3. Each incision 8, 8 'advantageously has the shape of a triangle with an inside 11, 1Γ and an outside 12, 12'.

The device for pressing the needle cylinder material over the inner sides 11, 11 'of all incisions 8, 8' of the steel webs 1 used consists of two coaxial rams 13,14 (Fig. 1), with a central bore 16 in the lower ram 13 the guide for one Pin 17 of the upper ram 14 forms. Both rams 13, 14 are equipped with cutting rings 18, 19 (Fig. 3 and 5), which come to lie opposite the incisions 8, 8 'of the steel webs 1, the cross-section of both cutting rings only the inner half of the incisions 8, 8 'fills the steel bars. The inner walls 20, 20 'of the cutting rings 18, 19 run parallel to the inner sides 11, 11' of the steel web cuts 8, 8 '.

To fasten the steel webs 1 in the needle cylinder 3, the needle cylinder 3 with the steel webs 1 inserted is pushed onto the offset pin 15 (Fig. 1) of the lower ram 13 that the lower end wall 4 of the needle cylinder 3 on the cutting ring 18 of the lower Press ram 13 comes to rest (Fig. 5), while the cutting ring 19 of the upper press ram 14 is located above the upper end wall 5 of the needle cylinder 3 (Fig. 3). During the vertical movement of the upper ram 14 in the needle cylinder 3, both cutting rings 18, 19 penetrate both the end walls 4 and 5 of the needle cylinder 3 (FIGS. 6 and 8) and the incisions 8, 8 'of the steel webs 1 to both end faces 21, 22 of the ram 13, 14 come to rest on the end walls 4, 5 of the needle cylinder 3. Because the cross-section of both cutting rings 18, 19 in relation to its dimensions only fills the inner half of all web cuts 8, 8 ', only the inner walls 20, 20' of the cutting rings 18, 19 press the needle cylinder material 23 laterally over the inner sides 11, 11 'of the Bar incisions 8, 8 'without the inner walls 20, 20' of the cutting rings touching the inner sides 11, 11 'of the incisions. The spaces remaining between the inner sides 11, 11 'of the web incisions 8, 8' and the inner walls 20, 20 'of the cutting rings 18, 19 are filled during cold pressing with material 23 of the needle cylinder 3, which expands laterally as a result of the pressing pressure and after pressing has ended Forms isosceles triangles 24 (FIG. 7) over the inner sides 11, 11 'of the web incisions 8, 8'. In this way, a solid connection on both sides of all steel webs 1 used with the needle cylinder 3 is achieved by cold pressing, the pressing pressure acting on the inner sides 11, 11 'of the web incisions 8, 8' being broken down in such a way that a relatively high pressure in radial direction to the longitudinal axis of the needle cylinder 3 is created, which ensures that the base 9 of each steel web 1 is in perfect contact with the bottom 10 of the associated longitudinal groove 2 of the needle cylinder 3. The web incisions 8, 8 'do not necessarily have to have an angular (e.g. triangular) shape, but can also have rounded (e.g. semicircular) shapes.

Claims (2)

Patent claims: 1. Needle cylinder for circular knitting machines with steel bars laterally delimiting the needle channels, which are inserted into the milled longitudinal grooves of the needle cylinder and extend over the entire length of the cylinder extend, characterized in that the steel webs (1) at their two opposite ends (6,7) incisions (8,8 ') have in which needle cylinder material (23) that is still related to the needle cylinder (3) stands, is pressed in. 2. A method for producing the needle cylinder according to claim 1, characterized in that for pressing needle cylinder material (23) into the incisions (8, 8 ') of the steel webs (1), the cutting rings (18, 19) of two in the needle cylinder (3) are coaxial guided ram (13, 14) penetrate into the end walls (4, 5) of the needle cylinder and into the incisions of the steel webs, the cross section of both cutting rings only filling the inner half of the incisions of the steel webs. Considered publications: German patent specifications No. 597 773, 682 112,
682168, 697 557, 749 777, 868 328, 939 081,
939 242; Austrian Patent No. 179 700; U.S. Patent No. 1,903,776; "Der Maschinenbau" magazine, 1956/6, p. 173. 1 sheet of drawings 409 560/44 4.64 © Bundesdnickerei Berlin